[jira] [Assigned] (CASSANDRA-3101) Should check for errors when calling /bin/ln

["Jonathan Ellis (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-3101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis reassigned CASSANDRA-3101:
-----------------------------------------

    Assignee: Vijay  (was: Pavel Yaskevich)
    
> Should check for errors when calling /bin/ln
> --------------------------------------------
>
>                 Key: CASSANDRA-3101
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3101
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.4
>            Reporter: paul cannon
>            Assignee: Vijay
>            Priority: Minor
>              Labels: lhf
>             Fix For: 1.0.2
>
>
> It looks like cassandra.utils.CLibrary.createHardLinkWithExec() does not check for any errors in the execution of the hard-link-making utility. This could be bad if, for example, the user has put the snapshot directory on a different filesystem from the data directory. The hard linking would fail and the sstable snapshots would not exist, but no error would be reported.
> It does look like errors with the more direct JNA link() call are handled correctly- an exception is thrown. The WithExec version should probably do the same thing.
> Definitely it would be enough to check the process exit value from /bin/ln for nonzero in the *nix case, but I don't know whether 'fsutil hardlink create' or 'cmd /c mklink /H' return nonzero on failure.
> For bonus points, use any output from the Process's error stream in the text of the exception, to aid in debugging problems.

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